Automatic die



Nov. 2, 1943. R. R. FINN 2,333,163

AUTOMATIC DIE Filed Dec. 22, 1941 s Sheets-Sheet 1 Nov. 2, 1943. R, R,FINN 2,333,163

AUTOMATIC DI E Filed Dec. 22, 1941 3 Sheets-Sheet 2 LL 7 f4 f5 1% J4 m Jm/ mum 21 4 L E 14 2,? Kg? I j (7/ if 046 x" 476/046 {7 PAh r If} 6 [/7Z b/XLW A g azwimw Nov. 2, 1943. R. R. FINN 2,333,163

AUTOMATIC DIE Filed Dec. 22, 1941 3 Sheets-Sheet 3 l of Figure 4.

Patented Nov. 2, 1943 AUTOMATIC DIE Robert R. Finn, Springfield, Vt.,assignor toJones i & Lamson Machine Company, Springfield, Vt., acorporation of Vermont 7 Application December 22, 1941, Serial No.123,876

Claims. 01. 10-95) Ths invention relates to automatic screw threadingdies and has for an object to provide a die which can be opened andclosed automatically but when closed may be locked against prematureopening as might otherwise be caused by rapid indexing of a lathe turretsupporting the i die.

A further object is to provide a die which; when operating on the work,is unlocked in condition to be released and opened when threading hasprogressed to the desired extent;

Still another object is to provide a construction wherein the diecan'progresswith the work under light pressure so as to avoid strippingof work threads of very fine pitch.

Another object is to provide a die which may be locked closed whenpresented to the work but which by such presentation is automatical- 1y,unlocked and conditioned for automatic, open- .ing when threading of thework has proceeded to a predetermined extent. For a more completeunderstanding of this in: vention, reference may be had to theaccompanying drawings in which I V Figures 1, 2 and 3 are side, frontand rear elevations, respectively, of a die embodying the invention, thedie being closed and locked, Figure being partly broken away and insection. Figure 4 is a longitudinal section on line 4-4 Figure, 2, but'with parts broken away or omitted. 1 -Figure dis a view similar to aportion of Fig. ure 4, but showing the die in cutting and unlookedcondition. Figure 6 is a cross sectional view on line 6- I Figure 7 is afragmentary longitudinal section on line of Figure 6., Figure 8 is adetail section on line 8-8-01 Fig ure 7. I

Figure 9 is a detail section on line 9-9 of Figure 4. v

Figure 10 is a view similar to Figure 9, but showing the die in workingand unlocked condition. i

Figure 11 is a view similar to Figure 9, but showing the die released bycontact of the release rod with a stop.

Figure 12 is a fragmentarypersective view of the die holder.

Figures 13 and 14 are perspective views of the die opening and closingring and of the locking and opening and closing actuating cam ring, respectively.

. positions, respectively.

Figure15 is a section: online I5- -I"5 of' Figure4. a Figures 16 andl'?are views similarto Figure 15, but showing the parts in cutting andreleased Figures [18, 19 and 20 are detail sections on thecorrespondingly numbered section lines of Figures 15, 16 and,17,,respectively. H l g Figure 21 is a view partly in side evation andpartly in section showing the; die in open position, the release ,havingbeen effectedibystop ping the progress ofthe die holder when threadinghasprogressedpto the desired extent.

The die as shown comprises a sleeve I having a shank portion, 2 and. anenlarged diameter head 3. The shank portion 2, is supported for limitedaxial motion inia. holder 4. The. head portion 3 has, an integral faceplate 5, as shown in Figure 1, having dovetailed ways .6 therein for thereception of chaser carrying blocks! to which ch'asers, as 8,,may besecured. Back of the face plate 5 and slidable axially on the head (Us adie openingand closing member 10 shown detached in Figure .13. Thismember l0 has on its forward face outwardly inclined fingers II whichproject throughjo'peningssfl of. the face plate 5 and engage in matingopenings I3 in the chaser blocks 1. As the member H1 is Inovedforwardlyfrom the position shown inFigure 21 to. that shown in Figure 4, thechasers and blocks are moved substantiallyradially toward the axis ofthe die thus to close-the die in conditionfor operating on the work asshown'in Figure 2. By' moving the member ID rearwardly from the' po-'sition shown in Figure4 to the position shown in Figure 21, the chasercarrying blocks are moved outwardly thus opening the die. I The memberI0 is pressed toward its open position as by means of springs I5 seatedinrecesses I6 and I! of the face plate andrin'g I0; respectively,-andmedia is closed and heldin closed position by means of a cam plate 20,shown detached in Figure 14. This cam plate lllhasinclined cam faces 2|adapted to'engage cam faces 22 on lugs 23 on the back-face of themember, the cam faces'Zl ofthe member 20 at times being positionedbetween the-cam lugs '23 in which position the die is maintained open bythe springs I5 By rocking the member 20 from this angular position,however, the-cam faces 2| may bemoved in engagement with'the cam faces,22," causing the member ill to be wedged forwardly into closeddisposition. This 4 member 20 is rockably mounted on thehead 3,

and is held up againstthe rear race of the mem- Erased esaiiiet her Inby means of a disk 25 backed up by a nut member 26 threaded onto therear end portion of the head 3. Adjustment of this nut 23 determines theextent of inward motion of the chasers to closed position. Means areshown for retaining the nut 26 in adjusted position comprising a pointedscrew 28 engaging between serrations 29 in t h'e periphery of the nut.25, this screw being barr'ied in a casing infember 3i] Secured to thering 25 and being adjustable in and out by means of a manuallyengageable The ringi25 is held against turning by a -%aii* of lugs 32and 33 projecting through sl ts -M therein, these lugs beingintegralgyith a fliange I portion 35 of the die holder 4. As is wellkn'own 31v M H of a pin 52 projecting across the bore of the in the art,the shank portion of this die holder may be clamped in position-1n asuitable teol holder such as a turret of a turret lathe. w h ile thelugs 32 and, 33 extend into the plane of the rifig member "ZUj theie i's-uflicient clearaffce in thi ringv memberto permit rocking motidhhf thring'n'i'mberfffl eetwen iie *a"g1i lar* p sition "where'-the"liig's"23can tween the feain faces 2!, the dle then be snown h'rttreao, tba *die'c v 111 further rid-leaking ee: sition shown infFigiiie"I8. TE-s fatter-position ivmibeinereruu nesefited' la er. 7 The'iielaerwe-ajacmtothe were is proyi'de'd V a'y'*be"pressed into"alioletherel sshowninFigure lfthisZelder/e 33 having a 'fiQtch at one"s'ide at 37 (see'Figures "9 and I2 "Adjacent 'to'thefileevefi'i a'oorfeermeds'crew 4b is 'threaded th'roiigh the member 35 and aiiut ".4 l isthreaded "on its opposite "eridto bear against the 'back face of theportion=3'5*"b'y which thef'extcfit that Lt'he' "cone: point 5 projectsfrom the" forward face'of "thep'ortion' 35 ma'y be adjiisted andffixed.This -cone pointproj ects toward" the back"edge"'o'f,aa*notch 421in1aradial extension or Wingi43"'of the member-52.0, (Figures 14 to 17) and"adjacent to thisnotchfifl; this membri43 'isLsho-wn'asproyided;withafiat'heade ed pIug144. :lnthegibcked :angular position :ofthe'f-meinber "20; thisarplug 44' isiipartlyrin alinlement"w'ith' theface 45'Q'at' one sideof the" notch 3'l 'ofthe sleeve? 3iiras shown inFigure ,9, 'so that in thisaangiilar and;;'axial='position of thememberzlil, the member 20*ha's .aclimited orwa'rd'a;;ialtmotionrwithrspiecttqthe, sleeve 35 beiore-it stfikesf'the'face 45 ofthe sleeve. When'the member 20 istin'ilthe ,an u1ai"position'corresponding to Figlli'fi;19:WhlfQ;th6:fll8 is closed butnotlacked,

ion 450i thesleevewandithere i 'I h T}Q. I e xtended;v ran e pi r laive; a ia moti tween these parts th s. m e v =e l21 e i =re1- a i lly. Wh re iz tt qiihe h lde e b twini gress plu sflfi s e 12 pasitien-thgonep m hfig is sufii e itly retracte is ed -iet arcinr r ess relative totheholderfi 1nto t in he ge This e geestne" Jot gigu'r i9, and it an diemitted when the ring 20 is in looking position,v since the member 44 isthen out of impinging relation to the face 45 of the limiting sleeve. Ifthereafter the holder 4 be held so that the die, while in engagementwith the work continues to be threaded thereonto, the cam face 46 of theWing 43 strikes against an oppositely inclined race 5 fl of a.rod 5|carried-within the sleeve 36 eeqg i rpwqe ie 'afi rii ib 1 i=+" sitionof FigureZO, whereupon the die is immediately opened by the action ofthe springs 55.

' This released axial position of the die head with to the holder 4 isshown in Figure 21.

The rod 5i has a limited axial motion in the eye *35 "being :p'reyentedfrom becoming detachedtherefroin, as shown in Figure 4, by means The,rod 5! is normally pressed forwardly as far asfi'fmitted by the slot 53and the pin 52, as by means ofarspring 4 reacting between :thEz-ffib.

wardend' of: t-1ie- -s1eeve--3i5- and a collar 55 gpinned tothe-rod 51". j'As soonas thedieds ppe-nedcand thus released-from the e e it.drawn back With-respect to' its hel'der i=4, thisnbeing accomplishedbyalightcoil; spring (seerZEigu-re A and 21) seated in a socket Si ina'plug This plug-has an; enlarged diameter portion fi3iorming -;a;pressed ;1fitin the rear :end offlthe holdere and; havinga fla l 64over-lapping the rear end of this holder is spring reac'tsiagainst'thebase 5 ofthe socket; 6 Land afcollarftdiheld ii-nw'p'ositiondey t;heheadpi ascrew ae tnreened into the reapextremity 6f fa "headedr'rodi6'! the? head as of which ma hgegefinre'ecumeibored'porn fifi withinthe' iieem, headl3 is'open at'its forwardendfasgatflbfto permit'the'ihsen tidi i offthe "rdd"'s1. The "rod vsrfnas efreduced iameterfree efidf linin a "shoulder 1 l which cause stripping of-theth1eadsonthework'when these threads j afe v'ery fine, it" being onlysumciently' heai'iy cause the. return' ofthe head" to thdbsitihh sh whinFigurenfwhn"thedie' has been "re easeeurtin ItheW rk, ."This f springi of itself fwouid "be"iiiisuYficienfly heaVy' to'prevententrifugaf'force' eke'rtd bathe head during the indexing of the turret.carrying the die-causing iorwaifdfirfotion there'of suflicient "to" open'the die; but" this "is'15revei1ted*when'thering zElis in lockingposition by impingementbf "the-member t4"e amstthe-saeumefl 5"of thesleeve 3 6. When the die is in idle position, thereforefithe ring zfl isturnedto locking%siti5n, such in erracting first to close the 5 yanys'uitable mealns as-is i wellkriown in the anew that i the poi tion43 engages the sleeve 38 as shown in Figurecifi.

It "will -be noted thatitherel': is ldsts ametibn between the shank 2and the plug 52 unaffected by the spring *60 "'rbetweenrthe'pos'iti'ons'=offi'the head "show-min Figures" ra-nd 5. The die isvthusfree to follow the lead of the threads onwthe work toa-sufiicientfixtent to allow :for-errors inaccuracy of 'thefeeding-mechanism; its position being controlled only bymthepressureofthe The die is thnclosed arid locked and the arious parts-are in the[position l'shown in? Figures 1 toe-9," 15 and' 1s whezi theiiaie'.isrresentd'tdthiWrk by for were pressure-exerted on thholdr"4","'the"'die"'head is'pressedvreen stopping the forward travel of theholder 4 with the die head as has been described. Another method of:opening thedie consists in stopping the forward movement of therod 5|as by impingement upon a stationary stop '12 as shown in Figure 11; Theforward movement of the die after this occurs causes the rod 5| to beretracted within the sleeve 36 against the pressure of the spring 54,causing the inclined face 50 thereof to: impinge on the cam face 46 ofthe wing and rock the member 20 to die open position.

In order to prevent access of dirt to the interior of the die, acircular shield member 15 surrounding and carried by the member andbridging over into a reduced diameter portion 16 of the face plateportion 5 maybe employed.

From the foregoing description of an embodimentofthis invention, itshould be evident to those skilled in the art that various changes andmodifications might be made without departing from the spirit or scopeof this invention.

, I claim:

1. In a die comprising a head, a holder for said head with respect towhich said head has a limited axial lost motion, chasers carried by saidhead and normally biased to open positions, means movably mounted onsaid head'for closing said die and for holding said die closed, andmeans actuated by motion of said head axially toward one limit of saidlost motion for moving said movable means to release said die to open,

means supporting said movable means for motion from diefopen positionbeyond closing position to locking position, means coacting with saidmovable means when said movable means is in by said head formotionbetween die open and die' closed positions, a member movably carried bysaid head and having operative engagement with said chasers for closingor opening said die by motion of said member,- means biasing said memberto die open position, an actuating member movably carried by said headand having means operatively related to said die opening and closingmember for moving said opening and closing memberto closed position bymotion of said actuating member in one directionand by further motion inthe same direction to locking position, and for releasing said openingandclosing member to permit opening of said die by motion of saidactuating member in the opposite direction, a die holder with respect towhich said head has a limited axial motion,

operative connections betweensaid holder and actuating member causingthe ,motion of said holder to press said head onto the work, causingrelative axial motion between said head and looking to holding position,and 'meansactu-i able on threading of the work to a predeterjminedextent to move said member from hold-- ing position in releasing"direction.

3. A die comprising a head, chasers supported by said head for motionbetween" die open and die closed positions, a member movably carried bysaid head and having operative engagement with said chasers for closingor opening said die by motion of said member, means biasing said memberto die open position, an actuating member" rockably carried by said headand .having means operatively related to said die opening and closingmember for moving said opening and closing member to closed position byrocking motion of said actuating member in one direction and by furthermotion inthe same direction to locking position, and for releasing saidopening and closing member to permit opening of said die by rocking ofsaid actuating member in the opposite direction, a die holder withrespect to which said head has a limited axial motion, op-

erative connections between said holder and actuating member causing themotion of said holder to press said head onto the work, causing rela-Ltive axial motion between said head and holder-,:

to rock said actuating member. from lockingi to holding position, andmeans actuated by relative.

axial motion between said head and holder thereafter, as said headthreads onto the work while said holder is stopped, to rock said.mem-'her from holding position in releasing direction.

4. A die comprising a head, chasers carried by said head, a membermovable on said headand operatively connected to said chasers for open'ing and closing said die, means tending to openv said die, a holdersupporting said head for lim-,

ited relative axial motion, an actuating member for said openingand'closing member movably 'carried'by said head, said actuating memberbeing movable on said head between die open, die closed, and die closedlocking positions, and operatively connected to said opening and closingmember, causing motion of said actuating member from die open to dieclosed position to move said opening and closing member to die closedposition, and means carried by said holder effective by relative motionof said holder and head as said head is pressed onto the work bypressure exerted on said holder to move said actuating member from dieclosed locking position to die closed position, said die including meansfor moving said actuating member from die closed position sufiicientl topermit said tending means to open the die when the work has beenthreaded to the desired extent.

5. A die comprising a head, a holder supporting said head for limitedrelative axial motion, chasers carried by said headand movable betweendie open and die closed positions, means tending to open said die, meansfor closing and releasing said die comprising a member rockably carriedby said head and movable axially relative to said holder between limits,means biasing said member to an axial position spaced a predeterminedamount from its, rearward limit, a stop carried by saidholder inposition to limit the forward motion of said member relative to saidholder only when said member is in locking angular p0sition,meansactuable by forward motion of said member beyond said stopped positionto turn said member from die closed to die open position, and meansactuated byrearward motion of said member from its biased position toturn said member fromdie locked angular posh tion to die closed angularposition in which die closed angular'position forward motion of saidmember to die open position is permitted.

6. A die comprising ahead, a holder supporting said head for limitedrelative axial motion, ohasers carried by said head and movable betweendieopen and die closedpositions'means tending to open said die, meansfor closing :and releasing said die comprising a member ro'clo ablycarried by said head and-movable axially beveled face for cooperationwith the beveled face of said rod to rock said member into die releasedposition, meansyieldingly: holding said rod atits forward limit ofmotion with its beveled face out of reach of said member beveled facewhen said member-is in locked angular pa.v

sition but in position to cooperate with said member face either byretraction of said rod or by forward motion of said member beyond itslock limited position to cause rocking of. said mem her from die closedto die openposition, and means effective toturn said member from lockedangular position to die closed position when said member is movedrearwardly from its biased axial position.

I. A die comprising ahead, a holder for said head and relative to whichsaid heod'may have limited axial motion, means tendin to hold aid headin one axi l position betweenits limits,

4?}, said head, and operative connections between aid mech nism and saidholder ausing axial motion of said head relative ov said h lder in onedirection from said position to change said, mechanism from locking toclosed. condition, and.

oper tive connections between said mechanism- 8, A diecomprising a head,a holder for said head and relative to which said head may-have limitedaxial motion, means tending to hold said head spaced a predeterminedamount from its rear, limit of motion, means tending to returnsaid headto said. spaced position when displaced forwardl therefrom, die opening,closing andloclrine' mechanismcarried by said head, and: operativeconnections between said mechanism; and holder causing rearward motionof said...

head from said. spaced positiona by pressure of the die onto the workwhile said holder is stationary, to cause said mechanism when in diedition.

closins and lockin mechanism carriedbY:

- 9. A die comprising a head, a holder for said head and relative towhich said head may have limited axial motion, means tending to holdsaid head spaced a predetermined amount from its rear limit of motion,means tending to return said head to said spaced position when displacedforwardly therefrom, die opening, closing and locking mechanism carriedby said head, opera ative connections between said mechanism and holdercausing rearward motion of said head from said spaced position, as bypressure exerted on said holder to start the die onto work, to conditionsaid mechanism from die locked to die closed condition, operativeconnections between said mechanism and holder causing the forward motionof said head from said spaced position relat tive to said holder as bythreading ofthedie onto the work while said holder is stationary, tocause saidmechanism when in die closed con.- dition to be changedito dieopen condition, and means for actuating said last named connectionstoohange said mechanism from die closed to die open positionirrespective of anymotion of said head relative to said holder.

10.. A die comprising a head, a holder for said head and relative towhich said head may have limited axial motion, means tending to holdsaid head spaced a predetermined amount from its rear limit of motion,means tending to return said head to said spaced position when displacedforwardly therefrom. die opening, closing and locking mechanism carriedby said head, operative connections between said mechanism and boldercausing rearward motion of said head from said paced position, as bypressure exerted on said holder to start the die onto work, to conditionsaid mechanism from die locked to die closed condition, and operativeconnection between said mechanism and holder causing the forward inotionof said head from said spaced position rela tive to said holder, as, bythreading of the die onto the work while said holder is stationary,

to cause said mechanism when in die closed condition to be changed todie open condition, and other means effective to change said mechanismfrom die closed to open condition irrespectiveof head and relative towhich said head may have any motion of said head relativeto said holder11. A die comprising a head, a holder for said head and relative towhich said head may have limited axial motion, means tending to holdsaidhead spaced a predetermined amount from its rear limit of motion, meanstending to return said head to said spaced position when displacedforwardly therefrom, die opening, closing and locking mechanism carriedby said head, and

operative connec ions between said mechanism 7 and holder causingrearward motion of said head from said spaced position, as by pressureexerted tween said mechanism and holder causing the forward motion ofsaid head from said spaced. position relative tosaid holder, ashythreading exerted on said holder tostart the die onto work. to conditionsaid mechanism from die. locked "to disclosed condition, and operativeconnections between said h1eohanism1and holder causing the. forwardmotion of said head from said spaced J position relative to said holder,as by threadin of the die on o the work while said h lder is stationary,to canoe said mechanism when the closed condition to be changed to dieopen condgtionsaid holder havin means cooperatin with Y said mechanismwhen said mechanism is indie locked condition to prevent forward motionof said head relative to said holder from said spaced posit-ionsuflicient to change said mechanism to die open condition.

:12; A die comprising a head, a holder for said head and relative towhich said head may have limited axial motion, said head having a shankportion and said holder having a sleeve in which said shank portion isaxially movable, arod extending through said shank portion and having ahead at its forward end for engagement of its rear face on said diehead, and a reduced diameter rear end portion defining a shoulder, an

element carried by said shank and through which said reduced diameterportion extends, said die head having a limited axial motion relative tosaid rod, spring means reacting between said element and said rodtending to hold said die head retracted with respect to said holder tothe for-- ward limit of axial motion of said die head relative to saidrod, yielding means reacting be tween said die head and holder tendingto hold said die head at said forward limit, die opening, closing andlocking mechanism carried by said die head, and operative connectionsbetween said mechanism and said holder causing relative motion of saiddie head rearwardly from said for- Ward limit of axial motion of saiddie head relative to said rod to condition said mechanism to die closedcondition, and forward motion of said die head against the pressure ofsaid spring means to change said mechanism to die open condition, saidholder and mechanism having means 00- operating when said mechanism isin die locked condition to prevent forward motion of said die headrelative to said holder sufficient to change said mechanism to die opencondition.

13. A die comprising a head, a holder for said head with respect towhich said head has a limited axial motion, chasers carried by saidhead, a member movably carried by said head and in operative engagementwith said chasers to close said chasers on motion of said member to adefinite position and normally biased away from said position to opensaid chasers, a locking member movably mounted on said head and havingthree positions in each of two of which it engages said movable memberand holds said movable mem ber in chaser closed position, and in thethird position it permits said movable member to move to said chaseropen position, means engageable with said locking member when in one ofits said two positions and actuable to move said locking member tochaser open position when the die has threaded Work to a predeterminedextent, means for preventing operation of said engageable r means tomove said locking member to die open position from the other of said twopositions, and elements on said holder and locki'ng'member cooperativelyengaging, on motion of said head relative to said holder throughpressure exerted on said head when said holder first presents said headto work to be threaded, to move said lock ingmeans from the other ofsaid two positions to said one of said two positions.

14. A die comprising a head, a holder for said head with respect towhich said head has a limited axial motion, chasers carried by said headand movable between open and closed positions, a member mounted on saidhead for axial motion and having parts operatively engaging said chasersto close said chasers on forward motion of said member froma retractedposition in which said member holds said chasers open, spring meanstending to hold said member in retracted chaser open position, and alocking member rockably carried by said head about an axis lengthwise ofsaid head and having three angular positions, elements on said lockingand axially movable members cooperating when said lockingmember isineither of two of said angular positions to hold said axial memberinforward closed chaser position but permitting said axially movablemember to assume chaser open position when,

said locking member is in the third angular position, cam parts on saidlocking member and holder cooperating on forward motion of said lockingmember with said head relative to said holder from an intermediateposition to rock said locking member from one of said two positions tosaid third position to permit opening of said chasers, parts of saidlocking member and holder when said locking member is in the other ofsaid two angular positions cooperating to prevent such forward motion ofsaid head with respect to said holder, said locking member and holderhaving cam parts cooperating when said locking member is in said otherangular position by motion of said head'rearwardly relativeto saidholder from said intermediate axial position, as when said head ispushed against the work by said holder, to rock said locking member fromsaid other angular position to said one angular position.

15. A die comprising a head, a holder for said head withrespectto whichsaid head has a limited axial motion, chasers carried by said head andmovable between open and closed positions, a member mounted on said headfor axial motion and] having parts operatively engaging said chasers toclose said chasers on forward motion of said member from a retractedposition in which said member holds said chasers open, spring meanstending to hold said member in retracted chaser open position, and alocking member rockably carried by said head about an axis lengthwise ofsaid head and having three angular positions, elements on said-lockingand axially movable members cooperating when said locking member is ineither of two of said angular positions to hold said axial member inforward closed chasers, parts of said locking member and holder whensaid locking member is in the other of said two angular positionscooperating to prevent such forward motion of said head with respect tosaid holder, said locking member and holder having cam parts cooperatingwhen said locking member is in said other angular position by motion ofsaid head rearwardly relative to said holder from said intermediateaxial position, as when said head is pushed against the Work by saidholder, to rock said locking member from said other angular position tosaid one angular position, said firstmentioned holder cam part beingmounted on said holder for motion toward said cooperating member partand provided with a portion for engagement with an actuating element bywhich said movable cam part may be moved to cooperate with its matingmember part and cause said locking member to release said chasers toopen..

ROBERT R. FINN.

- 1 CERTIFICATE OF CORRECTION. 7 Patent No. 2,555,165 V NOVember 2, 915.

ROBERT 'R. FINN.

It is hereby certified that error appears in the printed specificationof the above numbered patent fequiring correctionas follows: Page '14.,sec- 0nd column, line 1+6, claim 10, strike out head and felative towhich said head may have"; and that the said Letters Patent should beread with this corneeti on therein that the same may conform .to therecord of the case in the Patent Office. I a

Signed and sealed this 7th day of December, A. D. 1915.

Henry Van Arsdale, (36031 I Acting commissioner of jPatents.

